diff --git a/app/apis/home_assistant_api.rb b/app/apis/home_assistant_api.rb
index 78e6b2e..0716972 100644
--- a/app/apis/home_assistant_api.rb
+++ b/app/apis/home_assistant_api.rb
@@ -44,7 +44,7 @@ def problems
       end.compact
 
     unavailable_entity_problems = data
-      .select { _1[:state] == "unavailable" }
+      .select { _1[:state] == "unavailable" && Time.parse(_1[:last_updated].to_s) < 15.minutes.ago }
       .map do
         {
           icon: "triangle-exclamation",
diff --git a/test/apis/home_assistant_api_test.rb b/test/apis/home_assistant_api_test.rb
index bea2e8c..bc3c2a6 100644
--- a/test/apis/home_assistant_api_test.rb
+++ b/test/apis/home_assistant_api_test.rb
@@ -299,7 +299,7 @@ def test_problems_non_binary
   end
 
   def test_problems_unavailable
-    data = [{entity_id: "sensor.foo_bar", state: "unavailable"}]
+    data = [{entity_id: "sensor.foo_bar", state: "unavailable", last_updated: 30.minutes.ago}]
 
     api = HomeAssistantApi.new({})
     api.stub :data, data do